Influenza pandemic is no obvious characteristics of the seasonal, but in the winter Most of often suddenly and spread rapidly, with many popular short course. The spread of influenza speed and breadth, and the intensity of the relevant population, the higher the level of population congestion, the faster the epidemic, the greater the scope. Flu pandemic, is cyclical, an average of once every 10 to 15 outbreaks once. A pandemic, often two to three times higher prevalence.
The root causes of the pandemic, consider the following three factors: ① influenza incubation period is short, only 1 to 2 days; ② mainly through air droplets and direct contact transmission; ③ influenza virus, between the various types of non - Cross-immunity, but immunity does not exceed one year.
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